Interactions of molybdenum oxide with various oxide supports: calcination of mechanical mixtures

Journal Article · Mon Jun 01 00:00:00 EDT 1987 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(87)90072-8· OSTI ID:5366448

Stampfl, S R; Chen, Y; Dumesic, J A; Niu, C; Hill, Jr, C G

Laser Raman and Fourier transform infrared spectroscopies as well as X-ray diffraction were used to study the interactions of MoO/sub 3/ with various metal oxide supports. Intimate mechanical mixtures containing an amount of MoO/sub 3/ corresponding to less than a monolayer were calcined at 720 K. In the cases where the supports were TiO/sub 2/, SnO/sub 2/, Al/sub 2/O/sub 3/, and MgO surface molybdate species were formed on calcination via thermally induced spreading of the bulk MoO/sub 3/ phase. Interactions between the support and the MoO/sub 3/ were sufficiently strong in these cases that no bulk MoO/sub 3/ could be detected in the calcined mixture. A weaker interaction occurs in the case of SiO/sub 2/. Raman results from the calcined MoO/sub 3//TiO/sub 2/ mixture agree with spectra obtained from catalysts prepared by equilibrium adsorption and incipient wetness impregnation; the nature of the surface molybdate species is relatively independent of the preparation method. 24 references.

• Research Organization: Univ. of Wisconsin, Madison
• OSTI ID: 5366448
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 105:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CALCINATION
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
DECOMPOSITION
DIFFRACTION
DISPERSIONS
FOURIER TRANSFORMATION
INFRARED SPECTRA
INTEGRAL TRANSFORMATIONS
LASER SPECTROSCOPY
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MIXTURES
MOLYBDATES
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
RAMAN SPECTROSCOPY
REFRACTORY METAL COMPOUNDS
SCATTERING
SPECTRA
SPECTROSCOPY
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
TIN COMPOUNDS
TIN OXIDES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSFORMATIONS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION